ArangoDB v3.7 reached End of Life (EOL) and is no longer supported.

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Durability

Transactions are executed until there is either a rollback or a commit. On rollback the operations from the transaction will be reversed.

The RocksDB storage engine applies operations of a transaction in main memory only until they are committed. In case of an a rollback the entire transaction is just cleared, no extra rollback steps are required.

In the event of a server-crash the storage engine will scan the write-ahead log to restore certain meta-data like the number of documents in collection or the selectivity estimates of secondary indexes.